화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.35, No.5, 1099-1107, May, 2018
DOI10.1007/s11814-018-0016-x  Export Citation
Designed synthesis of silver nanoparticles in responsive polymeric system for their thermally tailored catalytic activity towards hydrogenation reaction
Muhammad Shahid1, Zahoor Hussain Farooqi1, †, Robina Begum2, Khalida Naseem1, Muhammad Ajmal3, and Ahmad Irfan4, 5
  • 1Institute of Chemistry, University of the Punjab, New Campus, Lahore 54590, Pakistan
  • 2Center of Undergraduate Studies, University of the Punjab, New Campus, Lahore 54590, Pakistan
  • 3Department of Chemistry, University of Wah, Wah Cantt 47040, Pakistan
  • 4Research Center for Advanced Materials Science, King Khalid University, P. O. Box 9004, Abha 61413, Saudi Arabia
  • 5Department of Chemistry, Faculty of Science, King Khalid University, P. O. Box 9004, Abha 61413, Saudi Arabia
E-mail:
Poly(N-isopropylacrylamide-acrylamide-methacrylic acid) [p(NIPa-AAm-Ma)] polymer microgels were prepared by free radical precipitation polymerization method. AgNPs were fabricated in the sieves of polymer network by chemical reduction using AgNO3 salt as a precursor of silver ions. Various techniques like dynamic light scattering (DLS), transmission electron microscopy (TEM), Fourier transform infrared microscopy (FTIR), and UV-Visible spectroscopy were used for characterization of pure and composite microgels. The diameter of AgNPs fabricated in polymeric network was found to be in the range of 10-15 nm. Stimuli responsive behavior of hybrid microgels was same as that of pure microgels. Catalytic efficiency of the hybrid microgels was investigated by reducing 4-Nitroaniline (4-NA) into 4-Aminoaniline (4-AA) using NaBH4 as reducing agent under different conditions of temperature of the medium, concentration of reducing agent, 4-Nitroaniline and hybrid microgels to explore the catalysis process. Kinetic and thermodynamic aspects of reduction of 4-Nitroaniline in the presence of catalyst were also discussed on the basis of values of Arrhenius and Eyring parameters like pre-exponential factor, activation energy, enthalpy of activation and entropy of activation. Catalytic activity of the hybrid microgels was found to be thermally tunable in the temperature range of 25- 70 °C. The value of rate constant (kapp) for reduction of 4-NA was minimum at 55 °C, which can be attributed to volume phase transition of the hybrid microgels.
Keywords:Microgels;Nanoparticles;Catalysis;Kinetics;Thermodynamics
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